feat: add Hatchling build hook for generating Java stubs

Author: tlambert03

pyproject.toml

@@ -32,12 +32,7 @@ classifiers = [
 
 # NB: Keep this in sync with environment.yml AND dev-environment.yml!
 requires-python = ">=3.9"
-dependencies = [
-    "jpype1 >= 1.3.0",
-    "jgo",
-    "cjdk",
-    "stubgenj",
-]
+dependencies = ["jpype1 >= 1.3.0", "jgo", "cjdk", "stubgenj"]
 
 [project.optional-dependencies]
 # NB: Keep this in sync with dev-environment.yml!
@@ -51,12 +46,16 @@ dev = [
     "pandas",
     "ruff",
     "toml",
-    "validate-pyproject[all]"
+    "validate-pyproject[all]",
 ]
 
 [project.scripts]
 scyjava-stubgen = "scyjava._stubs._cli:main"
 
+[project.entry-points.hatch]
+mypyc = "scyjava._stubs._hatchling"
+
+
 [project.urls]
 homepage = "https://github.com/scijava/scyjava"
 documentation = "https://github.com/scijava/scyjava/blob/main/README.md"

src/scyjava/_stubs/_hatchling.py

@@ -0,0 +1,38 @@
+"""Hatchling build hook for generating Java stubs."""
+
+import shutil
+from pathlib import Path
+
+from hatchling.builders.hooks.plugin.interface import BuildHookInterface
+from hatchling.plugin import hookimpl
+
+
+from scyjava._stubs._genstubs import generate_stubs
+
+
+class ScyjavaBuildHook(BuildHookInterface):
+    """Custom build hook for generating Java stubs."""
+
+    PLUGIN_NAME = "scyjava"
+
+    def initialize(self, version: str, build_data: dict) -> None:
+        """Initialize the build hook with the version and build data."""
+        breakpoint()
+        if self.target_name != "wheel":
+            return
+        dest = Path(self.root, "src")
+        shutil.rmtree(dest, ignore_errors=True)  # remove the old stubs
+
+        # actually build the stubs
+        coord = f"{self.config['maven_coord']}:{self.metadata.version}"
+        prefixes = self.config.get("prefixes", [])
+        generate_stubs(endpoints=[coord], prefixes=prefixes, output_dir=dest)
+
+        # add all packages to the build config
+        packages = [str(x.relative_to(self.root)) for x in dest.iterdir()]
+        self.build_config.target_config.setdefault("packages", packages)
+
+
+@hookimpl
+def hatch_register_build_hook():
+    return ScyjavaBuildHook